155415787514551 has 4 divisors (see below), whose sum is σ = 155415836024752. Its totient is φ = 155415739004352.

The previous prime is 155415787514527. The next prime is 155415787514563.

155415787514551 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155415787514551 - 2³¹ = 155413640030903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155415787554551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19081611 + ... + 25979596.

It is an arithmetic number, because the mean of its divisors is an integer number (38853959006188).

Almost surely, 2^{155415787514551} is an apocalyptic number.

155415787514551 is a deficient number, since it is larger than the sum of its proper divisors (48510201).

155415787514551 is an equidigital number, since it uses as much as digits as its factorization.

155415787514551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48510200.

The product of its digits is 98000000, while the sum is 64.

The spelling of 155415787514551 in words is "one hundred fifty-five trillion, four hundred fifteen billion, seven hundred eighty-seven million, five hundred fourteen thousand, five hundred fifty-one".